Adding an 11mm extension tube

November 2, 2017

Optics theory

The net effect of adding an extension tube between a lens and camera body is the “working distance” is decreased, that is, the distance from the front of the lens barrel to the subject is decreased. A smaller working distance means the same lens will focus closer to the subject, thereby increasing magnification.

The effect is greater at shorter focal lengths, as shown by the following annotated table of magnification for the two extension tubes sold by Fujifilm USA.

Table courtesy Fujifilm USA.

Theory into practice

On 27 October 2017 several Autumn Meadowhawk dragonflies (Sympetrum vicinum) were spotted perching on the small dock at Hidden Pond, Meadowood Recreation Area, Fairfax County, Virginia USA. All individuals featured in this photo gallery are male, as indicated by their terminal appendages.

All photos in this set were taken using my Fujifilm X-T1 digital camera, Fujinon XF55-200mm zoom lens, and a Fujifilm MCEX-11 extension tube. The camera was set for manual focus in order to use focus peaking; back-button focusing was used to focus automatically.

At 200mm, the working distance of the lens is 905 mm (90.5 cm, ~35.63 in), or approximately three (3) feet. With an 11mm extension tube mounted between the lens and camera body, the working distance is reduced to 665 mm (66.5 cm, ~26.2 in), or a little more than two (2) feet. At a focal length of 55mm, adding the extension tube would result in photos that look more like “macro” photos; at 200mm, adding the extension tube resulted in photos that look like a lens with a longer focal length was used to take the shots.

All of the following photos were slightly cropped for improved composition. The 11mm extension tube is the difference-maker that enables me to take close-up shots using a mid-range telephoto zoom lens such as the Fujinon 55-200mm.

ISO 640 | 200mm (~300mm, 35mm equivalent) | f/11 | 1/500s | -1 ev

ISO 640 | 200mm (~300mm, 35mm equivalent) | f/11 | 1/500s | -1 ev

When I changed the aperture from f/11 to f/16 (larger to smaller opening) for more depth-of-field, notice the ISO increased from 640 to 800. ISO was set for “Auto” with a limit of 800.

ISO 800 | 200mm (~300mm, 35mm equivalent) | f/16 | 1/500s | 0 ev

ISO 800 | 200mm (~300mm, 35mm equivalent) | f/16 | 1/500s | 0 ev

ISO 800 | 200mm (~300mm, 35mm equivalent) | f/16 | 1/500s | 0 ev

ISO 800 | 200mm (~300mm, 35mm equivalent) | f/16 | 1/500s | 0 ev

More tech tips

Focus peaking can be activated when the camera is set for manual mode. Using back-button focus (AF-L button) in manual mode enables one to retain full control of the exposure triangle, focus quickly, and see what’s in focus before shooting a photograph. Fuji Back Button Focus (4:06), a YouTube video by Ashraf Jandali, provides a clear demonstration of how to use back-button focus on the Fujifilm X-T1.

In order to reduce “camera shake,” I almost always shoot in shutter priority mode using the reciprocal rule. Remember, it’s the 35mm equivalent that matters: since my lens is ~300mm, the shutter speed should be set for at least 1/300s; in this case, it was set for 1/500s. In manual mode, I set the shutter speed and aperture; ISO was set for “Auto” with a limit of 800. An inexpensive Sunpak 6700M aluminum monopod was used for added stability.

Editor’s notes

Did you notice I didn’t use an external flash unit to shoot the preceding photos? The afternoon Sun is lower in the sky in late-October than it would be at the same time during mid-summer. I wanted to faithfully capture the shadows cast by the dragonflies in order to convey the feeling that the Sun is setting on these dragonflies, literally for the day as well as figuratively for the current odonate season.

Copyright © 2017 Walter Sanford. All rights reserved.

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Like a bad guest at a party

October 31, 2017

Common Whitetail dragonflies (Plathemis lydia) are like bad guests at a party — they are among the first odonates to arrive in spring and among the last to leave in fall. Unlike bad guests, it’s good to see Common Whitetails after a long, cold winter and you have to admire the fact that they survived a long, hot summer.

22 OCT 2017 | HMP | Common Whitetail (mature female)

The preceding photograph shows a Common Whitetail dragonfly that was spotted near a vernal pool at a remote location in Huntley Meadows Park, Fairfax County, Virginia USA. This individual is a mature female, as indicated by her terminal appendages and pattern of wing spots.

Copyright © 2017 Walter Sanford. All rights reserved.

Quick and dirty macro photos (Part 2)

October 29, 2017

A mating pair of Autumn Meadowhawk dragonflies (Sympetrum vicinum) was spotted on 25 October 2017 during a photowalk along the boardwalk in the central wetland area at Huntley Meadows Park, Fairfax County, Virginia USA. This pair is “in wheel.” The female is the primary subject; the tip of the male’s red abdomen is the secondary subject.

The first photo is my favorite in the set.

ISO 100 | 56mm (~300mm, 35mm equivalent) | f/4.1 | 1/800s | -1 ev

All odonates (dragonflies and damselflies) have a 10-segmented abdomen, numbered from front to back. Notice the small black “rivets” around the joint between segments seven and eight (S7, S8) of the male’s abdomen. Does anyone know the function of these structures?

ISO 100 | 56mm (~300mm, 35mm equivalent) | f/4.1 | 1/800s | -1 ev

Each compound eye has approximately 30,000 ommatidia!

ISO 100 | 56mm (~300mm, 35mm equivalent) | f/4.1 | 1/800s | -1 ev

Tech Tips

The photographs in this gallery were taken using my Panasonic Lumix DMC-FZ150 superzoom digital camera set for ~12x zoom, Raynox DCR-250 close-up filter, and Canon 580EX Speedlite external flash (manual mode). The close-up filter screws onto the front of the camera lens using a 52-43mm step-down ring.

I estimate the “working distance” between the camera and subject was approximately three-to-six inches (~3-6″). I attempted to photograph several mating pairs of Autumn Meadowhawks; this is the only pair that allowed me to get close enough to shoot some macro photos.

Related Resource: Quick and dirty macro photos (Part 1), a blog post by Walter Sanford featuring photos of male Autumn Meadowhawk dragonflies.

Copyright © 2017 Walter Sanford. All rights reserved.

Quick and dirty macro photos (Part 1)

October 27, 2017

Several Autumn Meadowhawk dragonflies (Sympetrum vicinum) were spotted on 25 October 2017 during a photowalk along the boardwalk in the central wetland area at Huntley Meadows Park, Fairfax County, Virginia USA. All of these individuals are male.

The photographs in this gallery were taken using my Panasonic Lumix DMC-FZ150 superzoom digital camera set for ~12x zoom, Raynox DCR-250 close-up filter, and Canon 580EX Speedlite external flash (manual mode). I estimate the “working distance” between the camera and subject was approximately three-to-six inches (~3-6″). Now that’s what I call cooperative models!

ISO 100 | 56mm (~300mm, 35mm equivalent) | f/4.1 | 1/800s | -1 ev

The following photo is my favorite in the set.

ISO 100 | 56mm (~300mm, 35mm equivalent) | f/4.1 | 1/800s | -1 ev

Each compound eye has approximately 30,000 ommatidia!

ISO 100 | 56mm (~300mm, 35mm equivalent) | f/4.1 | 1/800s | -1 ev

The Raynox DCR-250 close-up filter is a relatively inexpensive solution that enables my Panasonic superzoom digital camera to be used for macro photography. Set-up is quick and easy — the filter simply screws onto the front of the camera lens using a 52-43mm step-down ring.

As you can see, depth-of-field is very shallow, caused in part by shooting in Shutter Priority mode rather than Aperture Priority. A cooperative subject, good light, and a lot of patience are essential for success.

Related Resource: Quick and dirty macro photos (Part 2), a blog post by Walter Sanford featuring photos of a mating pair of Autumn Meadowhawk dragonflies (in wheel).

Copyright © 2017 Walter Sanford. All rights reserved.

Polymorphism or old age?

October 25, 2017

Some species of female odonates are polymorphic, meaning females can be one of two or more colors. In contrast, some species of female odonates become discolored with age.

The thorax and abdomen of female Autumn Meadowhawk dragonflies (Sympetrum vicinum) can be either tan or red. The difference in color is the result of either polymorphism or age-related discoloration. More research is required to establish cause and effect.

Several tan and red female Autumn Meadowhawks were spotted during a recent photowalk at Occoquan Bay National Wildlife Refuge, Prince William County, Virginia USA.

Tan

This individual is a tan female, as indicated by her terminal appendages and noticeably thicker abdomen than males of the same species.

Red

The following individuals are red females.

Copyright © 2017 Walter Sanford. All rights reserved.

Blue-faced Meadowhawk (Batch 4)

October 23, 2017

Batch 4 (of 4). Please look at the full-size version of each photo.

Several male Blue-faced Meadowhawk dragonflies (Sympetrum ambiguum) were spotted near a vernal pool at a remote location in Huntley Meadows Park, Fairfax County, Virginia USA.

The first photograph is my favorite in this batch; the second photo is, well, a close second place.

Related Resources

Copyright © 2017 Walter Sanford. All rights reserved.

Blue-faced Meadowhawk (Batch 3)

October 21, 2017

This gallery features photos from Batch 3 (of 4) showing male Blue-faced Meadowhawk dragonflies (Sympetrum ambiguum) spotted during a recent photowalk around a vernal pool at a remote location in Huntley Meadows Park, Fairfax County, Virginia USA.

Here’s looking at you, kid.

The last photograph is my favorite in this batch.

Related Resources

Copyright © 2017 Walter Sanford. All rights reserved.

Heaven on Earth?

October 19, 2017

Did I find Heaven on Earth? All signs point to yes!

17 OCT 2017 | Webb Nature Sanctuary | NOVA Parks

17 OCT 2017 | Webb Nature Sanctuary | NOVA Parks

Well, maybe. Time will tell. All I know now is I didn’t see any dragonflies anywhere along the trails at Webb Nature Sanctuary, Clifton, Virginia USA on 17 October 2017, my first visit to the park.

As odonate hunting season is winding down I’m transitioning into “exploration mode,” when I check out new places while the weather is still relatively mild.

Getting oriented

The following map is located at the trail head.

17 OCT 2017 | Webb Nature Sanctuary | NOVA Parks

Margaret’s Branch, located along Fern Valley Trail, is a small stream that might provide good habitat for lotic species of dragonflies such as clubtails and spiketails.

Popes Head Creek is known to provide good habitat for many species of odonates, including Fawn Darner dragonfly and Dusky Dancer damselfly, to name a couple of fall species.

17 OCT 2017 | Webb Nature Sanctuary | NOVA Parks

R. Randolph Buckley Park (also known as Eight-Acre Park) is located on the opposite side of Popes Head Creek from Webb Nature Sanctuary. Buckley Park can be accessed via a footbridge across Popes Head Creek.

Related Resource: Lentic and lotic, a blog post by Walter Sanford.

Copyright © 2017 Walter Sanford. All rights reserved.

More Blue-faced Meadowhawk

October 17, 2017

Batch 2 (of 4). Please look at the full-size version of each photo.

Several male Blue-faced Meadowhawk dragonflies (Sympetrum ambiguum) were spotted near a vernal pool at a remote location in Huntley Meadows Park, Fairfax County, Virginia USA.

The last photograph is my favorite in this batch. Which photo is your favorite?

Related Resource: Blue-faced Meadowhawk dragonflies [Batch 1].

Copyright © 2017 Walter Sanford. All rights reserved.

Great Spreadwing (practice oviposition)

October 15, 2017

This gallery — named “practice oviposition” (egg-laying) — features a six-photo time series of a female Great Spreadwing damselfly (Archilestes grandis).

Female Great Spreadwing damselflies, like all female odonates, have two cerci (sing. cercus), superior appendages that have little or no function. Also notice two styli (sing. stylus), structures that serve as sensors (like “curb feelers“) in egg positioning during oviposition.

(See a full-size version of the original photo, without annotation.)

The female uses her styli to guide the ovipositor into position, as shown in the next two photos.

In this case, I saw no evidence that the ovipositor actually penetrated the tree twig. I think this was a practice run in preparation for the real thing, as the title of this blog post says.

Copyright © 2017 Walter Sanford. All rights reserved.


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